photoelectric fluorometer

例句：

1. 1. This instrument is used to measure the concentration of pollutants in the air.
   这个仪器用于测量空气中污染物的浓度。
2. 2. The photoelectric fluorometer was used to detect the presence of mercury in the soil.
   光电荧光计被用来检测土壤中汞的存在。
3. 3. The accuracy of the photoelectric fluorometer was tested by comparing it with a more expensive alternative.
   光电荧光计的准确性通过将其与更昂贵的替代品进行比较来测试。